User manual

Testing the System
Campus-RS Fractional Interface Card User Manual 7-3
Remote to Local Interface
The Remote to Local loopback tests the local data port, the entire data path
inside the local Campus unit, the HDSL line, the HDSL transceivers of both
units, and most of the internal data path inside the remote unit.
Use this loopback to verify that the HDSL line is operational, and that the
HDSL transceiver of the remote unit is operational. This loopback also tests
the same areas as the Local to Local and Local HDSL loopbacks. The remote
host equipment is not involved in this type of loopback.
Remote to Remote Interface
The Remote to Remote loopback tests the remote data port and a small
portion of the remote Fractional Interface Card.
Use this loopback to verify that the remote host equipment, remote data cable,
and remote interface card are installed and configured properly. The local
host equipment is not involved in this type of loopback.
Local to Remote Interface
The Local to Remote loopback tests the remote data port, the entire data path
inside the remote Campus unit, the HDSL line, the HDSL transceivers of both
units, and most of the internal data path inside the local unit. This loopback
does not test the local data port drivers and receivers.
Use this loopback to verify data communication from the remote host device
to the internal data paths of the local Fractional Interface Card. The local host
equipment is not involved in this type of loopback.